Why does the auto start stop technology require a unique battery

Each startup process requires a lot of power from the car’s battery. To reliably produce a high beginning currently, the battery must be in excellent condition. The engine is turned off multiple times during the journey, especially in newer automobiles with auto start stop systems. During these stages, the battery continues to provide energy to all electrical customers. This charge output is not suitable for a standard starter battery (SLI) (i.e. continuous discharging and charging).

Only a battery with auto start stop technology will be able to meet these requirements and endure the load.

The starter batteries will be charged when running

A starting process is normally a one-time event in a car that does not have an auto start stop system. The generator serves the electrical equipment as an entertainment system and navigation device while driving, ensuring that the starter battery does not discharge during travel while the generator is running.

There is a twofold load on the auto start stop battery

For cars with auto star stop technology, the battery case is different. The battery goes through all start and stops intervals as it travels through town. Even if the car is stopped at a traffic signal, electrical consumers like lights, windshield wipers, radios, and displays require electricity. Continuous discharge and charging add to the load.

Short journeys, in particular, but the battery to the test. The battery’s charging capacity decreases with age and cold weather, so it can’t always be charged correctly on short trips. It may cause the batteries to gradually deplete until the batteries have full energy to begin the engine anymore. It may cause the battery to drain step by step until it has full power to begin the engine anymore. Because of the unique technology, the internal resistance of AGM batteries remains significantly lower over their entire life than that of conventional batteries, ensuring adequate charge acceptance over time and allowing AGM batteries to tolerate short travels with many auto start stop phases.

How many different kinds of batteries are used to start and stop vehicles 

Generally in the international standard, an enhanced flooded battery (EFB) or an absorbed glass mat (AGM) battery is used in a auto start stop vehicle. Both types supply the extra reserve power that auto start stop systems require.

Flooded battery with improved performance(EFB)

Generally, the enhanced flooded batteries (EFB batteries) are the kinds of flooded lead-acid batteries that have been improved. It’s utilized in auto start stop automobiles to help with starting, give greater standby power, and allow for regenerative braking recharging.

Advantages of an EFB battery over a flooded lead-acid battery with starting lighting ignition (SLI)

Compared to flooded lead-acid batteries, which can only provide roughly 30,000 stars, an EFB battery can deliver up to 85,000 stars.

The EFB battery gives up to 35% higher cranking power in comparison to the SLI flooded lead-acid battery.

With the difference between the flooded lead-acid batteries, and the EFB batteries are sure not to suffer from acid stratification issues. The tubes and channels in the EFB battery allow the water or the acid mixture to remix when the vehicle movement.

The EFB batteries will be more quickly discharged and recharged than the normal maintenance-free batteries.


AGM (absorbed glass mat) battery

The AGM battery consists of positive and negative plates and a separator, just like a normal SLI immersion lead-acid battery. AGM batteries, on the other hand, use absorbent glass mats between plates to absorb and hold liquid electrolytes, rather than sloshing between plates. The electrolyte is held securely against the plates by the glass mat, which acts like a sponge. An AGM battery has specific advantages over an SLI battery since the electrolyte is held so near to the plates.


How different of the AGM batteries and traditional lead-acid batteries

The cell density of AGM cells will allow for much surface contact between the electrolyte and the plate. Internal resistance is reduced, plate shedding is reduced, and battery life is increased as a result of the high pack pressure.

An AGM battery is designed to emit less gas than a standard flooded lead-acid battery. As a result, it lacks vent caps and isn’t completely vented to the atmosphere. It is called a fully reconstituted battery because it converts a greater proportion of the gas back to the electrolyte.

AGM batteries have a valve-controlled vent that only opens when the internal pressure reaches 3-7 psi. However, the pressure will be increased when the AGM batteries are charged at such high voltages and currents. Because the vent valve is a one-way check valve, overcharging an AGM can result in permanent electrolyte loss.

AGM batteries aren’t the same as gel cells.

Cylindrical AGM batteries are commonly referred to as gel cells. No, they aren’t. In the automotive field, gel batteries are never used for startup purposes.

Cylindrical cells are not found in all AGM batteries

Flat plate technology or winding cylindrical cells can be used to manufacture AGM cells. 

List the goodness of using an AGM battery instead of an SLI or an EFB battery

An AGM vehicle battery is designed to outperform a normal SLI battery in three ways:

Start the engine with a tremendous blast of energy.

Running the vehicle’s electronics for extended lengths of a lifetime when the engine is turned off.

Outlasts either an EFB or an SLI battery.

Lower the internal resistance.

During power demand and charging periods, glass mats and tight packaging make electronics flow more smoothly. AGM vehicle batteries are typically smaller and give more power than comparable flooded lead-acid SLI batteries.

The lower self-discharge rate of AGM batteries

Generally, all the lead-acid batteries self-discharge will be along with time. Because the AGM batteriesself-discharge rate will be lower than the SLI batteries, so you can keep them on in your warehouse or shop longer time with no recharging, and stores can keep them in the warehouse or shop longer time with no recharging.

AGM batteries have a higher sulfate content and are resistant to deterioration

Sulfation affects all car batteries, however, AGM batteries are less sensitive than flooded SLI batteries. What causes sulfation in batteries?

AGM batteries have a lower electrolyte loss.

The amount of hydrogen gas permitted to escape during charging is controlled by an internal valve in AGM batteries. Lead-acid batteries with these valves are known as valve-regulated batteries (VRLA). AGM batteries are more maintenance-free since they reduce the quantity of hydrogen and H2o released. An AGM battery does not require the addition of water.

AGM batteries's recharging rate is faster than the SLI batteries.

AGM batteriesrecharging is faster and at a lower voltage because they have a lower internal resistance, which decreases heat, and therefore increases battery lifespan. An AGM battery receives a charge five times faster than an SLI battery of the same size.

AGM batteries are more vibration-resistant.

AGM batteries shed less plate material than SLI batteries since there is no battery acid splashing around and the cells are tightly packed.

AGM batteries have excellent cold-starting abilities

The cold start current is high in AGM batteries. They provide a strong start to the starter motor and shorten its run time. Due to the cyclic stability of the AGM battery, the engine can be turned off and on many times in a short period, with no chance of restarting a failure.

Reserve capacity is high

The large reserve capacity ensures that all sorts of electrical components have access to electricity. AGM technology’s cycle stability ensures that power is delivered to components while also delivering a high starting power. Although the batteries are not 100% charged, due to the electronic assistant and consumer ensuring comfort are powered during parking, or the generator has been temporarily separated to lighten the engine load.

Why do automobile manufacturers choose an EFB battery over an AGM battery

Because an enhanced flooded batteries is less costly to manufacture. They outperform SLI batteries, although not as well as AGM batteries. If your car has an EFB battery, it must be replaced with another EFB battery. When using a normal immersed lead-acid battery in a auto start stop car, battery life is drastically reduced — just six months!

What happens if a wrong battery is installed in a auto start stop vehicle and what to do after a wrong install

Due to the EFB and AGM batteries being too much expensive than SLI batteries and dry batteries, the master can be enticed to swap out a failing EFB or AGM battery with an SLI battery. This is a major blunder. auto start stop vehicle’ charging systems presume you need to choose the correct battery and charge it per the EFB or the AGM charging agreement.

If you plan to replace an EFB or AGM battery with an SLI battery, however, the charging system may overcharge the battery and destroy it within 7 months and short its life.

Is it necessary to reprogramme a auto start stop car when the battery is replaced

Yes. The charging system adjusts its recharging cycle to meet the aging of an EFB or AGM battery. If you replace the same type of battery but do not update the vehicle’s computer, the new battery will continue to charge at the same rate as the old one and will soon break down. Reprogramming necessitates the use of a sophisticated scan tool. The vehicle computer will alter its recharging schedule depending on the fact that the battery is new once it has been reconfigured.


Because conventional start batteries are not designed to meet the higher requirements of these vehicles, auto start stop systems require modern batteries.

To function effectively and dependably, the architecture of current automobiles’ electrical systems necessitates the use of appropriate battery technology. If the wrong battery is installed in the car or is not properly registered, the battery will deteriorate prematurely, leading to another failure.

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